Need Simple, Easy-to-Use "Goof Proof" Audio Headshell Recommendation

Do you have the alignment gauge that came with the SL1200GR? 

If your cart has threads, just put both screws in and tighten until the cart will not slide easily in the headshell slots. Then using the gauge, line up the stylus tip as per Technics instructions. I wear a cheap pair of magnified glasses when doing this.

When you have it lined up, tighten one side a little more so that the cart can be rotated if need be. I then either measure the gap between the screw head and the end of the headshell slot or use a small screwdriver or other object as a feeler gauge. Rotate the cart if needed so the slot size is the same as the first. Tighten the other screw and recheck with the shim or measure. 

For carts that are not threaded, I just drop one screw in the headshell slot and slightly thread a nut on. Put the cart against the screw and headshell and tighten it up, it will now be easier to get the second screw and nut on. Do the same as above.

I have checked my results with other methods and this has worked every time for me.

your idea, sort of

concealed threaded holes

search, hifishark, headshell adjustable

thanks to you, I know about this one

Thanks for the comments.  I appreciate it!!  I do have all the alignment tools, i.e. Technics overhang gauge, protractor, VTA gauge, micro bubble level, and Fozgometer V2 with test record.  I can get the center/left/right channels fine tuned with the tools available to me.  I did find one product that may/may not work.  It's the Audio Technica AT-LH13/OCC Headshell which is available in Europe but not in the USA.  I reached out to the Danish vendor to see if the overhang adjustment will dial out to what the Technics table requires.  We'll see how that goes.  If not, I will continue using currently available headshells.  

this is similar, photos show it from bottom, LH13 probably similar.

azimuth: rotates on the barrel

overhang: the fitting has two sets of threaded holes, AND the fitting slides forward/back on the barrel

LH18 adjustable headshell

note: you need screws proper thread and length for your cartridge

note: no chance to adjust for null points slightly ’unparallell’ to the headshell.

note: probably shorter wires because the barrel is longer than many

kit includes alternate screws and insert shows 3 models: LH 13, 15, 18 

That's nice, but one issue with it is that when you loosen that set screw to adjust for overhang, you have to be very careful not to twist the headshell and thereby alter azimuth.  They ought to build in a guide on the barrel, so you can do one without danger of the other.